upload android base code part8
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/* simple-object.c -- simple routines to read and write object files.
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Copyright 2010 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Google.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include "libiberty.h"
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#include "simple-object.h"
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#include <errno.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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#include "simple-object-common.h"
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/* The known object file formats. */
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static const struct simple_object_functions * const format_functions[] =
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{
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&simple_object_elf_functions,
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&simple_object_mach_o_functions,
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&simple_object_coff_functions,
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&simple_object_xcoff_functions
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};
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/* Read data from a file using the simple_object error reporting
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conventions. */
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int
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simple_object_internal_read (int descriptor, off_t offset,
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unsigned char *buffer, size_t size,
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const char **errmsg, int *err)
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{
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if (lseek (descriptor, offset, SEEK_SET) < 0)
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{
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*errmsg = "lseek";
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*err = errno;
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return 0;
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}
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do
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{
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ssize_t got = read (descriptor, buffer, size);
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if (got == 0)
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break;
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else if (got > 0)
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{
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buffer += got;
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size -= got;
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}
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else if (errno != EINTR)
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{
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*errmsg = "read";
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*err = errno;
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return 0;
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}
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}
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while (size > 0);
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if (size > 0)
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{
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*errmsg = "file too short";
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*err = 0;
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return 0;
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}
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return 1;
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}
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/* Write data to a file using the simple_object error reporting
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conventions. */
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int
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simple_object_internal_write (int descriptor, off_t offset,
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const unsigned char *buffer, size_t size,
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const char **errmsg, int *err)
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{
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if (lseek (descriptor, offset, SEEK_SET) < 0)
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{
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*errmsg = "lseek";
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*err = errno;
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return 0;
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}
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do
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{
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ssize_t wrote = write (descriptor, buffer, size);
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if (wrote == 0)
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break;
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else if (wrote > 0)
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{
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buffer += wrote;
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size -= wrote;
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}
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else if (errno != EINTR)
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{
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*errmsg = "write";
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*err = errno;
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return 0;
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}
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}
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while (size > 0);
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if (size > 0)
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{
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*errmsg = "short write";
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*err = 0;
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return 0;
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}
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return 1;
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}
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/* Open for read. */
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simple_object_read *
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simple_object_start_read (int descriptor, off_t offset,
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const char *segment_name, const char **errmsg,
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int *err)
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{
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unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN];
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size_t len, i;
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if (!simple_object_internal_read (descriptor, offset, header,
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SIMPLE_OBJECT_MATCH_HEADER_LEN,
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errmsg, err))
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return NULL;
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len = sizeof (format_functions) / sizeof (format_functions[0]);
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for (i = 0; i < len; ++i)
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{
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void *data;
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data = format_functions[i]->match (header, descriptor, offset,
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segment_name, errmsg, err);
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if (data != NULL)
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{
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simple_object_read *ret;
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ret = XNEW (simple_object_read);
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ret->descriptor = descriptor;
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ret->offset = offset;
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ret->functions = format_functions[i];
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ret->data = data;
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return ret;
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}
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}
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*errmsg = "file not recognized";
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*err = 0;
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return NULL;
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}
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/* Find all sections. */
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const char *
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simple_object_find_sections (simple_object_read *sobj,
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int (*pfn) (void *, const char *, off_t, off_t),
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void *data,
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int *err)
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{
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return sobj->functions->find_sections (sobj, pfn, data, err);
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}
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/* Internal data passed to find_one_section. */
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struct find_one_section_data
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{
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/* The section we are looking for. */
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const char *name;
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/* Where to store the section offset. */
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off_t *offset;
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/* Where to store the section length. */
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off_t *length;
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/* Set if the name is found. */
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int found;
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};
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/* Internal function passed to find_sections. */
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static int
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find_one_section (void *data, const char *name, off_t offset, off_t length)
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{
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struct find_one_section_data *fosd = (struct find_one_section_data *) data;
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if (strcmp (name, fosd->name) != 0)
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return 1;
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*fosd->offset = offset;
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*fosd->length = length;
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fosd->found = 1;
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/* Stop iteration. */
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return 0;
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}
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/* Find a section. */
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int
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simple_object_find_section (simple_object_read *sobj, const char *name,
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off_t *offset, off_t *length,
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const char **errmsg, int *err)
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{
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struct find_one_section_data fosd;
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fosd.name = name;
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fosd.offset = offset;
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fosd.length = length;
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fosd.found = 0;
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*errmsg = simple_object_find_sections (sobj, find_one_section,
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(void *) &fosd, err);
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if (*errmsg != NULL)
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return 0;
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if (!fosd.found)
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return 0;
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return 1;
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}
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/* Fetch attributes. */
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simple_object_attributes *
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simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg,
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int *err)
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{
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void *data;
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simple_object_attributes *ret;
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data = sobj->functions->fetch_attributes (sobj, errmsg, err);
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if (data == NULL)
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return NULL;
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ret = XNEW (simple_object_attributes);
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ret->functions = sobj->functions;
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ret->data = data;
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return ret;
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}
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/* Release an simple_object_read. */
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void
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simple_object_release_read (simple_object_read *sobj)
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{
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sobj->functions->release_read (sobj->data);
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XDELETE (sobj);
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}
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/* Merge attributes. */
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const char *
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simple_object_attributes_merge (simple_object_attributes *to,
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simple_object_attributes *from,
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int *err)
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{
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if (to->functions != from->functions)
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{
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*err = 0;
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return "different object file format";
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}
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return to->functions->attributes_merge (to->data, from->data, err);
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}
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/* Release an attributes structure. */
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void
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simple_object_release_attributes (simple_object_attributes *attrs)
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{
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attrs->functions->release_attributes (attrs->data);
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XDELETE (attrs);
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}
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/* Start creating an object file. */
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simple_object_write *
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simple_object_start_write (simple_object_attributes *attrs,
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const char *segment_name, const char **errmsg,
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int *err)
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{
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void *data;
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simple_object_write *ret;
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data = attrs->functions->start_write (attrs->data, errmsg, err);
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if (data == NULL)
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return NULL;
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ret = XNEW (simple_object_write);
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ret->functions = attrs->functions;
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ret->segment_name = xstrdup (segment_name);
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ret->sections = NULL;
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ret->last_section = NULL;
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ret->data = data;
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return ret;
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}
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/* Start creating a section. */
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simple_object_write_section *
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simple_object_write_create_section (simple_object_write *sobj, const char *name,
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unsigned int align,
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const char **errmsg ATTRIBUTE_UNUSED,
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int *err ATTRIBUTE_UNUSED)
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{
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simple_object_write_section *ret;
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ret = XNEW (simple_object_write_section);
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ret->next = NULL;
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ret->name = xstrdup (name);
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ret->align = align;
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ret->buffers = NULL;
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ret->last_buffer = NULL;
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if (sobj->last_section == NULL)
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{
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sobj->sections = ret;
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sobj->last_section = ret;
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}
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else
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{
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sobj->last_section->next = ret;
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sobj->last_section = ret;
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}
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return ret;
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}
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/* Add data to a section. */
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const char *
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simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED,
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simple_object_write_section *section,
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const void *buffer,
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size_t size, int copy,
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int *err ATTRIBUTE_UNUSED)
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{
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struct simple_object_write_section_buffer *wsb;
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wsb = XNEW (struct simple_object_write_section_buffer);
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wsb->next = NULL;
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wsb->size = size;
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if (!copy)
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{
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wsb->buffer = buffer;
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wsb->free_buffer = NULL;
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}
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else
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{
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wsb->free_buffer = (void *) XNEWVEC (char, size);
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memcpy (wsb->free_buffer, buffer, size);
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wsb->buffer = wsb->free_buffer;
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}
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if (section->last_buffer == NULL)
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{
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section->buffers = wsb;
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section->last_buffer = wsb;
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}
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else
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{
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section->last_buffer->next = wsb;
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section->last_buffer = wsb;
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}
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return NULL;
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}
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/* Write the complete object file. */
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const char *
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simple_object_write_to_file (simple_object_write *sobj, int descriptor,
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int *err)
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{
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return sobj->functions->write_to_file (sobj, descriptor, err);
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}
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/* Release an simple_object_write. */
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void
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simple_object_release_write (simple_object_write *sobj)
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{
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simple_object_write_section *section;
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free (sobj->segment_name);
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section = sobj->sections;
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while (section != NULL)
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{
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struct simple_object_write_section_buffer *buffer;
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simple_object_write_section *next_section;
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buffer = section->buffers;
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while (buffer != NULL)
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{
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struct simple_object_write_section_buffer *next_buffer;
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if (buffer->free_buffer != NULL)
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XDELETEVEC (buffer->free_buffer);
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next_buffer = buffer->next;
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XDELETE (buffer);
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buffer = next_buffer;
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}
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next_section = section->next;
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free (section->name);
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XDELETE (section);
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section = next_section;
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}
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sobj->functions->release_write (sobj->data);
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XDELETE (sobj);
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}
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